Annealing



C. M. STEIN. ANNEAUNG. APPLICATION FILED`AUG. I8, 1919. I l

Patented Aug. 30, 1921.

21.1, ..4 ,.Upf... 0.......

EWEZ f UNITED STATES PATENT OFFICE.

CIIAELES II. STEIN, or PARIS, FRANCE, ASSIGNoE 'ro SOCIETE ANONYME DES ArrAEEILS DE 4NIANU'IIIIITION Er FOURS STEIN, or PAEIS, FRANCE, A

CORPORATION OF FI'tANCE.

To all whom t may concer/lt.'

Be it known th'at'I CHARLES M. STEIN, citizen of the French lepublic, residing at Paris, Department of the Seine, in France, and whose post-oilice address is 31 Boulevard Pereiro, in the said city, have invented certain new and useful Improvements in or in Connection with Annealing; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In the process of annealing 'it is usual to e''ect the operations in an oxidizing atmosphere and to rotect the articles from the deleterious actlon ofthis atmosphere by placing them in closed boxes or receptacles.

This method has serious disadvantages as, in the first place, it necessitates the consumption of fuel additional to that required to heatthe articles, to heat the boxes or receptacles and, in the second place, the boxes or receptacles wear out rapidly vand require frequent renewal.

The present` invention has for its object to enable the process of annealing to be carried out in animproved manner in a nonoxidizing atmosphere and without the employment of boxes or receptacles.

Furnaces have been proposed in which the process of annealing is 'carried out in a non-oxidizing atmosphere and without the employment ofboxes or receptacles, but the present invention is diferentiated therefrom in that the process is carried out in a muflie toy and in a non-oxidizing atmosphere consisting of the gas employed to heat the mulie which is introduced under pressure within the mule and subsequently consumed ex'- ternal thereto.

Referring now to the accompanying draw- Iigure 1 isa longitudinal section;

Fig. 2'is a cross section of the annealin furnace. e

The directions of flow of the air, gas and products of combustion are indicated by the single, double and triple-headed arrowsrespectively.

The articles 1 to be annealed, for example,

2 and are run on rai s or rollers 3 into the muie 4.

The furnace is heated by gas supplied Specification of Letters Patent.

laced von small trucks` ANN EALIN G.

Patented Aug. 30, 1921.

Application mea August 18, 1919. seran No. 318,169.

ternal surface. The products of combustion pass through vertical ducts intoI horizontal ducts 8 at the upper part of the furnace structure and flow from thence to the regenerators 7, which are heated thereby.

When the heating has continued for a 'sufficient timel to insure the annealing of the articles, the trucks 2 are run out of the muHe 4 and other articles introduced.

The invention is not limited to the details of construction of furnace illustrated.

I claim: y

1. An annealing furnace comprising a mule adapted to receive the articles to be annealed, a combustion chamber immediately surrounding said muflie, `means for admitting a non-oxidizing gas directly into said muile, openings' in the wall of said mule for allowing said gas to pass through the muflle into the surrounding chamber and means for admitting air into said Surrounding chamber to mix with said non-oxidizing. gasv forming a combustiblek mixture to be burnt .in said chamber for heating said mutile quently passes through openings in the wall 100 of the muile and is mixed with air and consumed in the combustion chamber immediately surrounding said muii'le.

In testimon whereof I aiix my signature l in presence o two Witnees'.

I CHARLES M. STEIN. Witnesses:

CHAS. -P. PREssIJY, A EMILE Klon. 

